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Answer is c.
(-b+/- sqrt(b*b-4ac))/2a
(-7+/-sqrt(7*7+4*2*15))/2*2
(-7+/-sqrt(49+120))/4 , sqrt (169)=13
(-7+13)/4=1.5
(-7-13)/4=-5
r>s so
r=1.5
s=-5
What is r-s?
1.5-(-5)=6.5=13/2
__________________
James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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